Leo manbelstamm



METAL CASTING MACHINE.

APPLICATION HLED 1AN.2|. 1919.

1,3 O9,534y Patented .my 8, 1919.

A TTORNEYS LEO MANDELSTAMM, OF NEW YORK, N. Y.

METAL-CASTING MACHINE.

Specification of Letters Patent.

Patented July 8, 1915).

Application filed January 21, 1919. Serial No. 272,305.

To all Hw/)L 'it 'may concer/n.'

Be it known that T, Liao l\I.\.\'m:is'r.\.\|.\i, a citizen of the UnitedStates7 and a resident of the cit)Y of New York, borough of Manlhattan.in the county and State of New York. have invented a new and ImprovedB'Ietal-(asting Machine, ot' which the following is a full. clear. andexact description.

This invention relates to n `ans and method .for casting precious orother metals and has particular reference to dental work in the makingof plates or teeth Afrom gold or the like.

A\mong the objects of the invention theret'ore is to improve theVfacilities t'or making a cast Ot' precious metal` which obviously isfrequently o't' very small capacity. aml which consequently is extremelydiflicult to perform under methods or by the use oll means ordinarilypractised.

More specifically stated my invention includes the provision of a cup orreceptacleI for holding the mold or investment. and above it the metalwhich at'ter being melted is to be delivered into the cavity .formed inthe mold. My apparatus also includes a plunger s0 arranged andconstructed as to be brought down over the molten metal to force thesame into the'cavity while the metal is still in a molten state.

lVith the foregoing and other objects in view the invention consists inthe. arrangement and combination ot' parts hereinafter described andclaimed, and while the invention is not restricted to the exact detailsof: construction disclosed 0r suggested herein, still for thel purposeof illustratingr a n'actical embodiment thereof reference is lad to theaccompanying drawing which is a vertical View partly in elevation andpartly in section.

Referring now more specifically to the drawing show an apparatuscomprising a base 10 having a depression or pit 1l. t'or holding astrong hollow receptacle or flask 12 having a cavity in which a mold orinvestment ot' plastic material 13 is made or placed. For some metalsthe investments are Very expensive and for casting large plates or thelike much heat and time are required. Hence I provide a casting machinewhereby I may use a small flask for small casts with ready interchangefrom one size to another, and yet with a plunger .suitably designed fordirect coperation with flasks of all standard sizes without interchangeot' plungers. The receptacle 12 may include a metal top 1l that may beremovable from the main portion ol the receptacle to facilitate theintroduction otI the mold. As to the particuhn' manner. however. olconstructing a receptacle oil a separable nature .l do not wish to beunnecessarily limited. It is to be noted. however. that the top portionl-t ol' the receptacle is provided with a concavity for holding themetal indicated at r/ while it is being melted. and from which themollen metal is subsequently to be `forced or driven through a hole l-l`formed in the bottom of the top member 1l aml registering with aby-pass lli leading to the cavity in the mold for the purpose oi'filling the cavity.

Fixed in any suitable lnanner lo the base and extending therefrom is anuprightstandard l5 preferably ot' cylimlrical torni lor reasons soon toappear.

lf isa hollow cylindrical collaradjustable up and down along thestandard lo any desired height and adapted to be secured in fixedposition by a set screw lT or its equivalent. 'l`his collar might be ol'other l'orm than c vlimlrical` but preferably it is l'ormed as shown soas to l'acililate the :uljustment and lockingr thereof with respect tothe standard.

1H is a plunger comprising two main parts namely a bonnet lf) and ashank 2l). 'l`he bonnet comprises a strong shell 21 having an opening inits bottom sulliciently large to lrcely admit the lop ol' thelreceptacle lL. Otherwise the shell 'il is imperl'orate or closed. andthe shank z2() is secured to the top thereotl by any suitable rigidmeans including a cap 22 and pin 22%. The cap is so constructtal as topossessalnple stiffness for the purposes of the. press.

An arm 2t is swiveled upon the standard l5 just above the collar lo andis adapted to be swung around the axis ot the standard as well as beingadjustable vertically along the cylindrical upper end ol.` the standard.The arm .Zllincludes a sleeve J5 having a set. screw 26, or itsequivalent, through which the arm may be, locked from rotation aroundthe standard 'l5 it' desired. At the opposite end of the arm is a sleeve27 in which the shank 2O is slidable t'reely. Between the sleeves Q5 and27 there is fitted to the arm an upstanding finger 9.8 constitilting avFulcrum or second class lever :'29, thel lever being pivoted to thefinger through a pin 30. At 3l the lever is pivoted through a` pin andslot connection to the upper end of the shank 20. Between the shank 20and the finger 28 is a spring 32 having a normal tendency to expand andelevate the lever swinging it upward around the pivot pin Si 'lhe lowerend of the spring is seated in a lsocket while the upper end ot thespring embraces a stud 3l fitted into the lever; thus the spring is heldtrom lateral displacement with respect to either the arm or the lever.

The shell 2l ot' the plunger is densely packed and filled with somesuitable retractory material such as asbestos or mineral wool indicatedat P35. The operation of my casting` press may be brieliy sunnnarized as`follows: ln view ot' the foregoing specificv description according tothe. height of the receptacle l2, the plunger and supporting meanstherefor are adjusted at such a height on thestandard l5 as to justpermit the bottom ot' the plunger to pass freely over the top ot thereceptacle when swung around the standard. rlhis preliminary adjustmentis etieeted mainly by the adjustment of the collar 16, and then is fixedby the set 'screw t7. lt the screw 26 is loose it is obvious that theplungei.' and parts associated therewith may be swung freely in ahorizontal plane either over or to one side of the receptacle. lt to beunderstood in this connection that the spring acts automatically toelevate the plunger and hold it in elevated position except when theouter end of the lever is depressed forcibly. lilith the plunger swungto one side and with the receptacle l2 in place and lilled with the moldas indicated the metal to be melted is placed in the concave top of thereceptacle and is then subjected to sull'icient heat to melt it, such asmight be furnished with an ordinary blow pipe, er its equivalent. Whenthe metal is melted the plunger is swung in a horizontal plane aroundthe axis of the standard to bring the open bottom of the shell 2ldirectly over the receptacle, and the arm may be locked in this positionif desired by tightening the screw 26. l/Vhether locked or not, however,the operator may then depress the outer end of the lever forcing theplunger downward against the tensionof the spring 32 and causing theasbestos packing 35 to bear directly downward upon the molten metal andtorce it through the small holes l and 13 into the mold cavity.Urdinarily the molten metal ldoes not iiow downward through such smallholes without being forced. The metal does not etl'ect the packing 35 inthe shell. and hence fo a similar work the saine equipment may be usedrepeatedly. lVhen'the casting has been made the spring 32 will elevatethe plunger to its normal elevated position acting upward upon the leverQ9 so that the plunger is free to swing laterally out of the way.

l claim:

In a. casting press of: the character set forth, the combination with aflask or receptacle adapted to contain an investment of a sizeproportional to the cast to be made and having a concave top to hold themetal to be cast, a plunger movable in a horizontal. plane into positionclose over the flask and molten metal in the top ot the flask, saidplunger comprising a drum-like shell of larger diameter than any flaskused and having an opening in its bottom and being completely n'lledwithv "compressed fibrous refractory material adapted to come intodirect contact with the molten metal, and means to torce the plungerdow'nwardv to drive the molten metal into the cavity in the investment.,

LE() lllANDELS'lAB/M.

